AC compressor clutch relay location

ECHOSYN

MEMBER

1991 TOYOTA COROLLA

1.6L

4 CYL

FWD

AUTOMATIC

192,000 MILES

I have searched for eight hours to find the location of the A/C compressor clutch actuating relay. The manual is wrong, the cover plate at driver side kick plate is wrong and the posters in Toyota Nation sixth generation Corolla are wrong. The passenger side kick plate at door post has nothing but insulation behind it. No person seems to know what a "assist" plate referenced on the driver side kick plate cover is. The problem is that the clutch stopped pulling in when A/C is turned on. I have not found a wiring diagram for less than $50.00. Hair pulling time again. I did find the relay online: 4-Seasons 35980 Relay - HVAC Relay.

8 Replies

Check out the diagrams (Below). Please let us know what you find. Cheers

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Tuesday, March 14th, 2017 AT 7:37 PM

STEVE W.

EXPERT

Looks like it is in the fuse/Relay block number five. Located on the left side of the engine compartment between the headlight and fuse block number two and behind the battery on the inner fender. Item ten on the diagram.

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Tuesday, March 14th, 2017 AT 7:48 PM

ECHOSYN

MEMBER

Thank you. I have not rested from searching since 4:00 pm. My car is a 1991 Toyota Corolla Wagon Base DX with 4AFE 1.6L engine, no electric door locks, no anti-theft, no luxuries and no A/C Amplifier. In fuse/relay block five diagram there is a round 22A relay in position eight and that relay is fairly new and metered good. That relay position can likely have different functions in different models. I have not found a single parts house statement that says what that relay is for. The wiring diagram you shared does not apply to this car. So I keep searching.

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Tuesday, March 14th, 2017 AT 9:55 PM

WRENCHTECH

EXPERT

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Wednesday, March 15th, 2017 AT 5:46 AM

ECHOSYN

MEMBER

Thanks guys. I found no definite confirmation thay my model of Corolla has the A/C Amplifier. I did finally find all of the other relays, switches and fuses. With that done and all checking good I established that the high pressure switch opened due to low R12. Followup with a gauge confirmed it. Next step is to take it to a highly recommended auto A/C tech and pay for a full upgrade to R134A. The car is fully upgraded and restored otherwise. I printed all of your offerings to put in the Corolla file. Thanks again.

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Wednesday, March 15th, 2017 AT 3:38 PM

ECHOSYN

MEMBER

Not at all. I plan to pay for a full and professional A/C upgrade and I need to know this car inside and out. I suspected that the R12 was leaking. The drive train and all other systems have been fully restored. The 1991 Corolla Owner's Manual and Haynes Toyota Corolla '84-'92 manual lack specifics about this simple DX Base Wagon. The diagrams are for the models with the most gadgets. Some sites suggest that this model does not have the A/C amplifier. I have to take out the glove compartment to know for sure. The fewer gadgets the better. Toyota of Irving told me that this model was made in Japan. That might explain its uniqueness.

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Wednesday, March 15th, 2017 AT 4:31 PM

WRENCHTECH

EXPERT

You don't have to go looking for it. I gave you the wiring diagram that clearly shows the amplifier in the circuit. It's mounted on top of the evaporator case.

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Wednesday, March 15th, 2017 AT 4:43 PM

ECHOSYN

MEMBER

The drawing and the schematic are for the luxury models with all the gadgets. My car is Base DX with no luxury and gadgets so I cannot depend on those to be accurate. A schematic of my specific car will tell me what I need to know. It does not have cruise control, electric door locks, air bags, etc. The only electronics is the engine control. When I enter in a search engine "A/C Amplifier 1991 Toyota Corolla Wagon DX" I get nothing specific to my car.